From Middle French lénité, from Latin lenitas.
leniency, mercy, forgiveness (plural lenities)
There comes a point in which a charitable interpretation of an interlocutor’s motivation, veracity, and ethics becomes asymptotic to unbelievable.
The person or people with whom you are speaking crosses the line of credulity.
The appropriate, nay, dutiful response must therefore be to cross the line of lenity. To not reestablish one’s position in the face of aggressive fraud is to make the world a worse place by allowing the mendacious to flourish.
The line must not be crossed with haste, nor eagerness, yet fear of failure —fear of being proved wrong —must not keep the virtuous on the wrong side of the line of lenity, whilst awaiting metaphysical certitude. To do so would be to fail in virtuous duty for the sake of selfish desire.